Getter flag



Dec. 1, 1959 R s 2,915,172

GETTER FLAG Filed Dec. 19, 1958 INVENTOR.

Q 660196 L. Rabid! Arm/3N5) United States Patent M GETIER FLAG George L.Rishell, Emporium, Pa., assignor, by mesne assignments, to SylvaniaElectric Products Inc., Wilmington, Del., a corporation of DelawareApplication December 19, 1958, Serial No. 781,625

4 Claims. (Cl. 206-.4)

This invention relates to getters such as are utilized in electron tubesto chemically clean up residual gases therein after they had beenevacuated through the use of pumps or the like.

In some electron tubes because of the geometry of the electrodes as wellas thatv of the insulating spacers, and because of the desirability offlashing the getter in only certain areas of the tubes, toroidal shapedgetter supports or flags have been'employed. A common form of getterflag comprises a washer of nickel with indentations in a surface of thewasher to receive the getter pellets to be flashed and the washer iscovered by a second nickel washer, suitable channels or cuts being madein the washers to permit volatilization and dispersion of the pelletswhen they are flashed.

It is an object of the invention to provide a getter support or flag ofthe washer type with getter pellet cover material and yet at a saving oflabor in assembling the parts and in the amount of flag materialutilized.

For a fuller understanding of the invention attention is directed to thefollowing specification when taken in conjunction with the accompanyingdrawing in which:

Fig. 1 is a plan view of the getter flag and contained pellets.

Fig. 2 an end elevation thereof.

Fig. 3 is a fragmental view of the flag showing an apertured getterpellet retainer.

Fig. 4 is a similar view showing a channeled getter retainer and Fig. 5is an enlarged fragmentary sectional view taken on the line 5-5 of Fig.1.

In carrying out my invention, a single thickness of a nickel plate isemployed instead of the laminated plates of the prior art and the plateis initially stamped out to form a circular disc 10. By the same tool,four center flaps 12, trapezoidal in plan view, are formed, as well asfour depressions 14 in the body of the plate. After the stampingoperation, getter pellets 16 are placed in the depressions. Then theflaps are bent over at their bases into overlapping relationship withthe plate, thus leaving a central opening 18. The flay does not tightly2,915,172 Patented Dec. 1, 1959 ted lines in the position it had beenbefore it was bent over a portion of the plate containing a getterpellet.

If desired, as indicated in Fig. 3, the flaps 14 may be provided withslots 20 to permit easy dispersion of the pellet material upward whenflashed or, as'indicated in Fig. 4, with channels 22 leading from thefar ends of the pellet recesses to the periphery of the washer tofacilitate radial dispersion of the material.

The getter loaded flag is suitably carried by a fixed part of theelectron tube by being welded thereto, as is customary in the art.

Having described the invention, Whaft is claimed is:

1. A getter assembly comprising a washer having an outer periphery andan inner opening bounded by a wall, depressions in the upper surface ofthe washer, getter pellets in said depressions, and flaps having baseportions integral with said wall and overlying the depressions.

2. A getter comprising a planar washer having an outer periphery and aninner central opening bounded by a wall, flaps formed out of the planarmaterial of the washer integral with the washer and having base portionsconnected with the washer at said wall, depressions in the upper face ofsaid washer, and getter pellets in said depressions, said flaps lying incontact with the washer and overlying the pellets.

3. A getter assembly comprising a washer having an outer periphery andan inner opening bounded by a wall, depressions in the upper surface ofthe washer, getter pellets in said depressions, and flaps having baseportions integral with said wall and overlying the depressions, saidflaps being slotted to permit dispersion of the getter material uponvaporization thereof.

4. A getter assembly comprising a washer having an outer periphery andan inner opening bounded by a Wall, depressions in the upper surface ofthe washer, getter pellets in said depressions, and flaps having baseportions integral with said wall and overlying the depressions, saidflaps being channeled to permit dispersion of the getter material uponvaporization thereof.

References Cited in the file of this patent UNITED STATES PATENTS2,093,273 Haslauer Sept. 14, 1937 2,209,870 Anderson July 30, 19402,282,302 Bickley May 5, 1942 2,462,813 Reiner Feb. 22, 1949 2,822,080Buescher et al Feb. 4, 1958

